Ultra-fine fiberglass separator At present, ultra-fine glass fiber separator (AGM) is commonly used in VRLA batteries. The wettability is the main characteristic of the separator capable of adsorbing the maximum amount of electrolyte. The separator must have long-term stable chemical and electrochemical corrosion resistance in the battery, it must not release any substances that increase the gas evolution rate, corrosion or self-discharge, and it must have good tensile strength to ensure that the separator is in the battery. will not be punctured by sharp edges or small particles during production assembly.

The separator is an important component of the battery and is not an active substance. In some cases it even plays a decisive role. The material itself is an electronic insulator, and its porosity makes it ionically conductive. The resistance of the separator is an important performance of the separator, which is determined by the thickness of the separator, the porosity, and the degree of tortuosity of the hole, and has an important influence on the capacity and terminal voltage level of the high-rate discharge of the battery; The stability of the separator in sulfuric acid directly affects the life of the battery; The elasticity of the separator can delay the shedding of the positive active material; the pore size of the separator affects the short-circuit degree of lead dendrites. Due to the various effects of the separator on the performance of the lead-acid battery, every improvement in the quality of the separator is accompanied by the improvement of the performance of the lead-acid battery.

After the UPS battery has been used for a period of time, the UPS battery will experience different degrees of loss. In order to save maintenance costs, some users will replace the battery with larger loss with a new one. However, many users do not know that this approach will greatly shorten the service life of the battery. Because there are more chemical reaction substances in the new battery, the voltage at the battery terminal is higher and the resistance is lower. However, the terminal voltage of the old battery is low and the internal resistance is large.

In the use of UPS batteries, sometimes new and old UPS batteries are used in series. As everyone knows, this approach will shorten the service life of UPS batteries. Because the new UPS battery has more chemical reaction substances, the terminal voltage is high, and the internal resistance is small (the internal resistance of the new 12V UPS battery is only 0.015-0.018Ω); while the terminal voltage of the old UPS battery is low, the internal resistance is large (12V The internal resistance of the old UPS battery is above 0.085Ω).

(1) Characteristics of premature loss of capacity: When low antimony or lead-calcium is the grid alloy, the capacity suddenly drops in the early stage of battery use (about 20 cycles), which makes the battery ineffective. Almost every cycle the battery capacity will drop by 5%, and the rate of capacity drop is faster and earlier. In the past few years, the batteries of the lead-calcium alloy series often appeared inexplicably with a decrease in the capacity of several batteries. Analysis of the positive plate did not soften, but the positive plate capacity is extremely low.

The failure of lead-acid batteries is the result of a combination of many factors, which is determined by the internal factors of the plates, such as the composition of active substances. Crystal form, porosity, plate size, grid material and structure, etc., also depend on a series of external factors, such as discharge current density, electrolyte concentration and temperature, discharge depth, maintenance conditions and storage time. The main external factors are described here.

Due to the differences in the types of plates, manufacturing conditions and use methods, the reasons for the failure of batteries are different. To sum up, the failure of lead-acid batteries has the following situations: 1. Corrosion variant of positive plate There are three types of alloys currently used in production: traditional lead-antimony alloys, with an antimony content of 4% to 7% by mass; low antimony or ultra-low antimony alloys, with an antimony content of 2% by mass or less than 1% by mass Fraction, containing tin, copper, cadmium, sulfur and other modified crystal agents; lead-calcium series, actually lead-calcium-tin-aluminum quaternary alloy, the content of calcium is 0.06% to 0.1% mass fraction. The positive grids cast from the above alloys will be oxidized into lead sulfate and lead dioxide during the charging process of the battery, which will eventually lead to the loss of the function of supporting active substances and the battery failure; or due to the formation of lead dioxide corrosion layer, lead to lead dioxide. The alloy produces stress, which causes the grid to grow and deform. When the deformation exceeds 4%, the entire plate will be destroyed, and the active material will fall off due to poor contact with the grid, or short-circuit at the bus bar.

The battery memory effect refers to the reversible failure of the battery, that is, the performance that can be restored after the battery fails. The battery automatically maintains this specific tendency after being subjected to a specific duty cycle for a long time. In layman's terms, the battery remembers the node of the last charge and discharge, resulting in the failure to break through this node in the future, resulting in a reduction in battery capacity.

The charging control methods of lead-acid batteries and lithium battery chargers are different. The difference is that the materials used are different, and the principle of discharge is also different. The quality of charging and discharging of batteries and lithium batteries will directly affect the electrical performance and service life of the batteries.

When it comes to batteries, we have to say the car start-stop system. That is, when the vehicle is temporarily stopped (such as waiting for a red light) during the driving process, it will automatically turn off. A system that automatically restarts the engine when it's time to move on.

The difficulty of sealing lead-acid batteries is the electrolysis of water during charging. When the charging reaches a certain voltage (generally above 2.30V/cell), oxygen is released on the positive electrode of the battery, and hydrogen is released on the negative electrode. On the one hand, the released gas brings out the acid mist to pollute the environment, on the other hand, the water content in the electrolyte decreases, so it is necessary to add water for maintenance at intervals.